Dalil
العربية

Quran As-Saf 61:4

إِنَّ ٱللَّهَ يُحِبُّ ٱلَّذِينَ يُقَٰتِلُونَ فِي سَبِيلِهِۦ صَفّٗا كَأَنَّهُم بُنۡيَٰنٞ مَّرۡصُوصٞ

Translation

Indeed, Allāh loves those who fight in His cause in a row as though they are a [single] structure joined firmly.